Disertacije | Repository of the Faculty of Science

: Sedimentološke karakteristike južnog dijela Istarskog fliškog bazena; Krešimir Petrinjak
Tema istraživanja su klastične naslage Istarskog fliša. Zajedno sa Foraminiferskim vapnencima, one čine ispunu Dinarskog predgorskog bazena koji je postojao na području Istre za vrijeme srednjeg eocena. Naslage fliša sastoje se od autohtonih hemipelagičkih lapora i naslaga taloženih iz gravitacijskih tokova. Za potrebe istraživanja analiziran je niz sedimentoloških stupova i točaka opažanja te su izdvojeni i opisani sedimentološki facijesi: olistoliti, megaslojevi, ruditni...

: Self-assembled Ge/Si core/shell quantum dots in alumina matrix for application in photo-electric conversion; Nikolina Nekić
Semiconductor materials confined in one or more dimensions exhibit special properties due to the quantum confinement effect. When confined in all three dimensions, a quantum dot (QD) is formed. Because of the confinement, energies of the QDs are discrete and depend on the QD size, enabling control of the absorption. Core/shell structures are somewhat more complicated but have several advantages over the regular core-only QDs. The shell could be used as a core passivation, a protective layer...

: Self-dual and LCD codes from two class association schemes; Ana Grbac
The main subjects of the thesis are LCD codes constructed from two class association schemes, i.e. from adjacency matrices of strongly regular graphs and doubly regular tournaments. In this thesis, we describe two methods of construction of self-dual codes. Firstly, a method of constuction of quadratic double circulant codes which was given by P. Gaborit in [28]. A method introduced by S. T. Dougherty, J.-L. Kim and P. Solé in [26] represents its generalization and it refers to the...

: Semilinear equations for non-local operators; Ivan Biočić
This doctoral thesis deals with semilinear equations for non-local operators in bounded domains in higher dimensions: For a bounded domain \(D \subset \mathbb{R}^d, d \geq 2\), a non-local operator \(L\), and a function \(f : D \times \mathbb{R} \rightarrow \mathbb{R}\), the following problem is being solved \(Lu(x) = f (x, u(x)), x \in D\), (1) where we also impose boundary conditions in \(D^c\) and/or on \(\partial D\), depending on the type of the non-local operator \(L\). The first type...

: Senzorska svojstva funkcionaliziranoga nanostrukturiranoga silicija; Nikola Baran
Jedna od glavnih tema istraživanja u modernoj senzorici obuhvaća funkcionalizaciju nanostrukturiranih materijala u svrhu poboljšanja osjetljivosti i selektivnosti senzora. Eksperimentalni put prema unapređenju senzora uključuje izradu i karakterizaciju materijala velike specifične površine, njihovo tretiranje fizikalnim i kemijskim metodama, te ispitivanje njihovog odziva na pokusne agense. Doktorski rad će biti baziran na izradi nanostrukturiranog silicija, s naglaskom na porozni...

: Separation of viruses and viroids using monolith chromatography Izdvajanje virusa i viroida monolitnom kromatografijom; Jelena Ruščić
Tekućinska kromatografija visokog učinka (high performance liquid chromatography, HPLC) je jedna od najznačajnijih i najuspješnijih metoda koje se primjenjuju za razdvajanje i pročišćavanje raznih molekula. Većina kromatografskih nosača je dizajnirana za razdvajanje proteina te je primjena ove metode u istraživanju makromolekula i makromolekularnih kompleksa otežana. Građa klasičnih nosača se temelji na poroznim kuglicama, a razdvajanje na difuziji. Zbog neadekvatne veličine...

: Sferno simetrično trodimenzionalno nestacionarno gibanje mikropolarnog kompresibilnog viskoznog fluida; Ivan Dražić
Predmet istraživanja disertacije je sferno simetrični trodimenzionalni model kompresibilnog viskoznog izotropnog i toplinski provodljivog mikropolarnog fluida koji je u termodinamičkom smislu savršen i politropan. U prvom dijelu temeljem konstitutivnih jednadžbi za opisani fluid te zakona očuvanja izvodi se u Eulerovoj deskripciji matematički model toka promatranog fluida između dvije termički izolirane koncentrične čvrste sferne stijenke u trodimenzionalnom euklidskom prostoru, a...

: Sfernosimetrična rješenja u kovarijantnoj f(T) modificiranoj teoriji gravitacije; Marko Sossich
Modificirana teorija gravitacije poznata kao f(T) gravitacija oslanja se na torziju kao temeljno svojstvo prostorvremena. Kako bi se istražila predviđanja ove teorije, ona je primijenjena na niz problema iz područja kozmologije, dok su njena predviđanja u području sferno simetričnih problema istražena u znatno manjoj mjeri. Predloženo istraživanje usredotočuje se na konstrukciju sfernosimetričnih rješenja i proučavanje njihovih svojstava u okviru tzv. kovarijantne inačice...

: Shape derivative techniques in optimal design; Petar Kunštek
Optimal design theory, also known as shape optimization is quite indispensable in many fields like aeronautics, architecture, medicine, computer science. Applications vary from classical, as construction of an aircraft wing, to more recent as in inverse problems of electrical impedance tomography (non-invasive method of medical scanning), picture segmentation or in 3D printing. From the engineering point of view the main aspect of design process is improving a current design. In such optimal...

: Sigma models, generalized geometry and applications in field and string theories; Grgur Šimunić
In this thesis we study the interplay between topological sigma models and generalized geometry. Firstly, they are related through generalized gauging procedure by the notion of Lie algebroids replacing the more conventional situation of Lie algebras. Furthermore, the gauging of the 2-dimensional string models in the target space with the background metric g and a closed 3-form H is closely related to Dirac structures of exact Courant algebroids. Here we expand on this, firstly by showing...

: Simultaneous laser cooling of multiple atomic species using a frequency comb; Danijel Buhin
I present the results of the theoretical calculation of the interaction of two counter-propagating pulse trains with six-level atoms. In the model, we calculate the radiation pressure force and the diffusion coefficient exerted on the atoms. The temperature of atoms is calculated using a Fokker-Planck equation. I present how frequency comb (FC) parameters affect the process of laser cooling. Results of the calculation suggest that the laser cooling with an FC is most effective when the...

: Singular BGG complexes for the symplectic case; Rafael Mrđen
Let \(G\) be a semisimple Lie group and \(P\) its parabolic subgroup. It is well known that any finite-dimensional simple \(G\)-module allows a resolution by invariant differential operators acting between direct sums of homogeneous bundles over the generalized flag manifold \(G/P\). Such a resolution is called the Bernstein-Gelfand-Gelfand (BGG for short) resolution. In the dual setting, this corresponds to the resolution of a finitedimensional simple \(\mathfrak{g}\)-module by direct sums...

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